when a man sneezed beside the prophet (May peace be upon him), he said to him : Allah have mercy on you, but when he sneezed again, he said : The man has a cold in the head. (Using translation from Abū Dāʾūd 5037)   

عَطَسَ رَجُلٌ عِنْدَ النَّبِيِّ ﷺ فَقَالَ «يَرْحَمُكَ اللَّهُ» ثُمَّ عَطَسَ أُخْرَى فَقَالَ «الرَّجُلُ مَزْكُومٌ»